I have no doubt that Nellie Ohr was one of the contractors given access to the NSA database. It must also be remembered that she was the one who initiated contact with Fusion GPS in November 2015 to get a job researching Trump and Flynn.
Her husband likely would have been the guy to "clear" that access to the NSA before Admiral Rogers found out about it and put his foot down. It is certain that someone at a very high level would have had to. There was an internal NSA investigation as to who actually accessed that database and what they took with them, the results of which we'll never see but that Trump has.